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Derivative Instruments, Hedging Activities and Fair Value Measurements, Nonrecurring Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Asset Impairment Charges [Abstract] |  |
Non-cash asset impairment charges | $ 8.8 | $ 11.0
Impairment of long-lived assets to be disposed of by sale | 5.0 |
Impairment of long-lived assets disposed of other than by sale | 3.8 | 11.0
NGL Pipelines and Services [Member] |  |
Asset Impairment Charges [Abstract] |  |
Non-cash asset impairment charges | 2.6 | 1.0
Onshore Natural Gas Pipelines and Services [Member] |  |
Asset Impairment Charges [Abstract] |  |
Non-cash asset impairment charges | 0.2 | 0
Onshore Crude Oil Pipelines and Services [Member] |  |
Asset Impairment Charges [Abstract] |  |
Non-cash asset impairment charges | 1.0 | 0
Petrochemical and Refined Products Services [Member] |  |
Asset Impairment Charges [Abstract] |  |
Non-cash asset impairment charges | 5.0 | 10.0
Fair Value, Measurements, Nonrecurring [Member] | Long-lived Assets Disposed of Other Than By Sale [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Assets, fair value | 0 | 0
Fair Value, Measurements, Nonrecurring [Member] | Long-lived Assets Disposed of By Sale [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Assets, fair value | 0.1 |
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member] | Long-lived Assets Disposed of Other Than By Sale [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Assets, fair value | 0 |
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member] | Long-lived Assets Disposed of By Sale [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Assets, fair value | 0 |
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member] | Long-lived Assets Disposed of Other Than By Sale [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Assets, fair value | 0 |
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member] | Long-lived Assets Disposed of By Sale [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Assets, fair value | 0 |
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Long-lived Assets Disposed of Other Than By Sale [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Assets, fair value | 0 |
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Long-lived Assets Disposed of By Sale [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Assets, fair value | $ 0.1 |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2611-110228 + Details
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- Definition The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 + Details
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